Dírhavel was known as a poet, though he only produced a single poem. Drawing on the knowledge and memories of the people of Doriath, Dor-lómin, and other lands of Beleriand that were gathered at the Mouths of Sirion, he wrote Narn i Chîn Húrin ("Tale of the Children of Húrin"), telling the story of Morgoth's curse on Húrin's children Túrin and Nienor. It was written in Sindarin, and the longest of all the lays to come out of Beleriand.
Dírhavel did not write other poems or lays, as the Silmaril captured by Beren and Lúthien was in the keeping of Elwing. The Sons of Fëanor launched an attack on the exiles in the Havens of Sirion to claim it. Dírhavel was one of those who fell in the Third Kinslaying.
Gundor would have to be his ancestor because all descendants of Galdor are accounted for.